112 THE NAUTILUS. 
ON A NEW SPECIES OF HOLOSPIRA FROM TEXAS. 
BY WM. H. DALL. 
Holospira pasonis n. s)). 
Shell white, mostly smooth but hardly glossy, of eleven and a 
half whorls; two and a half smooth, inflated, nepionic whorls, the 
apex flattish, followed by several whorls which are minutely ribbed 
in harmony with the incremental lines, the ribbing gradually becom- 
ing obsolete over most of the shell but reappearing on the last whorl, 
especially the basal part, sharper and somewhat crowded just behind 
the reflected lip ; umbilicus closed or reduced to a minute chink; 
suture distinct, sutural edge continuing as a keel to the reflected 
margin of the aperture; aperture very short necked, almost circular 
broadly reflected ; the pillar, as usualin the genus, tubular above the 
last whorl, the axis externally simple but somewhat flexuous. Lon. 
22-5, max. diam. 6°5 mm. E] Paso County, Texas, from Mule caiion at 
an elevation of 4000 feet. This species is nearest to H. coahuilensis 
W. G. Binney, which has one or two more whorls, the last two propor- 
tionately more attenuated with more extended, sharper and more dis- 
tant sculpture, and obtusely keeled or compressed base resulting in 
a much more triangular and narrower aperture. It is not particu- 
larly close to any of the other species hitherto described, the H. semi- 
striata Stearns being quite distinct. A marked character is the 
evenly rounded basal part of the whorl just behind the lip. 
The specimens were procured by a correspondent of Mr. J. A- 
Singley. 
MEGATEBENNUS BIMACULATUS. 
BY MRS. M. F. BRADSHAW. 
One day last September I found a curious and interesting mollusk. 
On a ledge of rocks, so high as only to be reached by the waves at 
the highest tides, there was a hollow containing a barrel or more of 
water. 
Poking around in this I saw what appeared to be a bit of flesh. 
I took it out, thinking I had found a small Lucapina crenulata, 
